"outfront" next, the latest on the investigation into the newtown shootings. and we have new details tonight on the suspected gunman. what we have been learning from his autopsy, from an autopsy of his brain and from a close friend. plus, the hero teacher, vicky soto. what she did for her kids. later, in the face of horror, citizens around the world have come together to make a difference. let's go "outfront." good evening, everyone. i'm erin burnett in newtown, connecticut. "outfront" searching for answers. that's what we've all been doing, trying to understand how this happened and why it happened. investigators in connecticut returned to the home of the gunman. the suspected gunman, 20-year-old adam lanza, searching for evidence. so far, authorities have been unable to retrieve any information from his computer, which was found smashed to pieces in the house he lived in with his mother, nancy.